drivers/net/wireless/ath/ath9k/wmi.c

   1 /*
   2  * Copyright (c) 2010 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "htc.h"
  18
  19 static const char *wmi_cmd_to_name(enum wmi_cmd_id wmi_cmd)
  20 {
  21         switch (wmi_cmd) {
  22         case WMI_ECHO_CMDID:
  23                 return "WMI_ECHO_CMDID";
  24         case WMI_ACCESS_MEMORY_CMDID:
  25                 return "WMI_ACCESS_MEMORY_CMDID";
  26         case WMI_GET_FW_VERSION:
  27                 return "WMI_GET_FW_VERSION";
  28         case WMI_DISABLE_INTR_CMDID:
  29                 return "WMI_DISABLE_INTR_CMDID";
  30         case WMI_ENABLE_INTR_CMDID:
  31                 return "WMI_ENABLE_INTR_CMDID";
  32         case WMI_ATH_INIT_CMDID:
  33                 return "WMI_ATH_INIT_CMDID";
  34         case WMI_ABORT_TXQ_CMDID:
  35                 return "WMI_ABORT_TXQ_CMDID";
  36         case WMI_STOP_TX_DMA_CMDID:
  37                 return "WMI_STOP_TX_DMA_CMDID";
  38         case WMI_ABORT_TX_DMA_CMDID:
  39                 return "WMI_ABORT_TX_DMA_CMDID";
  40         case WMI_DRAIN_TXQ_CMDID:
  41                 return "WMI_DRAIN_TXQ_CMDID";
  42         case WMI_DRAIN_TXQ_ALL_CMDID:
  43                 return "WMI_DRAIN_TXQ_ALL_CMDID";
  44         case WMI_START_RECV_CMDID:
  45                 return "WMI_START_RECV_CMDID";
  46         case WMI_STOP_RECV_CMDID:
  47                 return "WMI_STOP_RECV_CMDID";
  48         case WMI_FLUSH_RECV_CMDID:
  49                 return "WMI_FLUSH_RECV_CMDID";
  50         case WMI_SET_MODE_CMDID:
  51                 return "WMI_SET_MODE_CMDID";
  52         case WMI_NODE_CREATE_CMDID:
  53                 return "WMI_NODE_CREATE_CMDID";
  54         case WMI_NODE_REMOVE_CMDID:
  55                 return "WMI_NODE_REMOVE_CMDID";
  56         case WMI_VAP_REMOVE_CMDID:
  57                 return "WMI_VAP_REMOVE_CMDID";
  58         case WMI_VAP_CREATE_CMDID:
  59                 return "WMI_VAP_CREATE_CMDID";
  60         case WMI_REG_READ_CMDID:
  61                 return "WMI_REG_READ_CMDID";
  62         case WMI_REG_WRITE_CMDID:
  63                 return "WMI_REG_WRITE_CMDID";
  64         case WMI_RC_STATE_CHANGE_CMDID:
  65                 return "WMI_RC_STATE_CHANGE_CMDID";
  66         case WMI_RC_RATE_UPDATE_CMDID:
  67                 return "WMI_RC_RATE_UPDATE_CMDID";
  68         case WMI_TARGET_IC_UPDATE_CMDID:
  69                 return "WMI_TARGET_IC_UPDATE_CMDID";
  70         case WMI_TGT_STATS_CMDID:
  71                 return "WMI_TGT_STATS_CMDID";
  72         case WMI_TX_AGGR_ENABLE_CMDID:
  73                 return "WMI_TX_AGGR_ENABLE_CMDID";
  74         case WMI_TGT_DETACH_CMDID:
  75                 return "WMI_TGT_DETACH_CMDID";
  76         case WMI_AGGR_LIMIT_CMD:
  77                 return "WMI_AGGR_LIMIT_CMD";
  78         }
  79
  80         return "Bogus";
  81 }
  82
  83 struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
  84 {
  85         struct wmi *wmi;
  86
  87         wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
  88         if (!wmi)
  89                 return NULL;
  90
  91         wmi->drv_priv = priv;
  92         wmi->stopped = false;
  93         skb_queue_head_init(&wmi->wmi_event_queue);
  94         mutex_init(&wmi->op_mutex);
  95         mutex_init(&wmi->multi_write_mutex);
  96         init_completion(&wmi->cmd_wait);
  97         tasklet_init(&wmi->wmi_event_tasklet, ath9k_wmi_event_tasklet,
  98                      (unsigned long)wmi);
  99
 100         return wmi;
 101 }
 102
 103 void ath9k_deinit_wmi(struct ath9k_htc_priv *priv)
 104 {
 105         struct wmi *wmi = priv->wmi;
 106
 107         mutex_lock(&wmi->op_mutex);
 108         wmi->stopped = true;
 109         mutex_unlock(&wmi->op_mutex);
 110
 111         kfree(priv->wmi);
 112 }
 113
 114 void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv)
 115 {
 116         unsigned long flags;
 117
 118         tasklet_kill(&priv->wmi->wmi_event_tasklet);
 119         spin_lock_irqsave(&priv->wmi->wmi_lock, flags);
 120         __skb_queue_purge(&priv->wmi->wmi_event_queue);
 121         spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags);
 122 }
 123
 124 void ath9k_wmi_event_tasklet(unsigned long data)
 125 {
 126         struct wmi *wmi = (struct wmi *)data;
 127         struct ath9k_htc_priv *priv = wmi->drv_priv;
 128         struct wmi_cmd_hdr *hdr;
 129         void *wmi_event;
 130         struct wmi_event_swba *swba;
 131         struct sk_buff *skb = NULL;
 132         unsigned long flags;
 133         u16 cmd_id;
 134 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 135         __be32 txrate;
 136 #endif
 137
 138         do {
 139                 spin_lock_irqsave(&wmi->wmi_lock, flags);
 140                 skb = __skb_dequeue(&wmi->wmi_event_queue);
 141                 if (!skb) {
 142                         spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 143                         return;
 144                 }
 145                 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 146
 147                 hdr = (struct wmi_cmd_hdr *) skb->data;
 148                 cmd_id = be16_to_cpu(hdr->command_id);
 149                 wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 150
 151                 switch (cmd_id) {
 152                 case WMI_SWBA_EVENTID:
 153                         swba = (struct wmi_event_swba *) wmi_event;
 154                         ath9k_htc_swba(priv, swba);
 155                         break;
 156                 case WMI_FATAL_EVENTID:
 157                         ieee80211_queue_work(wmi->drv_priv->hw,
 158                                              &wmi->drv_priv->fatal_work);
 159                         break;
 160                 case WMI_TXRATE_EVENTID:
 161 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 162                         txrate = ((struct wmi_event_txrate *)wmi_event)->txrate;
 163                         wmi->drv_priv->debug.txrate = be32_to_cpu(txrate);
 164 #endif
 165                         break;
 166                 default:
 167                         break;
 168                 }
 169
 170                 kfree_skb(skb);
 171         } while (1);
 172 }
 173
 174 void ath9k_fatal_work(struct work_struct *work)
 175 {
 176         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
 177                                                    fatal_work);
 178         struct ath_common *common = ath9k_hw_common(priv->ah);
 179
 180         ath_dbg(common, ATH_DBG_FATAL, "FATAL Event received, resetting device\n");
 181         ath9k_htc_reset(priv);
 182 }
 183
 184 static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
 185 {
 186         skb_pull(skb, sizeof(struct wmi_cmd_hdr));
 187
 188         if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
 189                 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
 190
 191         complete(&wmi->cmd_wait);
 192 }
 193
 194 static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
 195                               enum htc_endpoint_id epid)
 196 {
 197         struct wmi *wmi = (struct wmi *) priv;
 198         struct wmi_cmd_hdr *hdr;
 199         u16 cmd_id;
 200
 201         if (unlikely(wmi->stopped))
 202                 goto free_skb;
 203
 204         hdr = (struct wmi_cmd_hdr *) skb->data;
 205         cmd_id = be16_to_cpu(hdr->command_id);
 206
 207         if (cmd_id & 0x1000) {
 208                 spin_lock(&wmi->wmi_lock);
 209                 __skb_queue_tail(&wmi->wmi_event_queue, skb);
 210                 spin_unlock(&wmi->wmi_lock);
 211                 tasklet_schedule(&wmi->wmi_event_tasklet);
 212                 return;
 213         }
 214
 215         /* Check if there has been a timeout. */
 216         spin_lock(&wmi->wmi_lock);
 217         if (cmd_id != wmi->last_cmd_id) {
 218                 spin_unlock(&wmi->wmi_lock);
 219                 goto free_skb;
 220         }
 221         spin_unlock(&wmi->wmi_lock);
 222
 223         /* WMI command response */
 224         ath9k_wmi_rsp_callback(wmi, skb);
 225
 226 free_skb:
 227         kfree_skb(skb);
 228 }
 229
 230 static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
 231                               enum htc_endpoint_id epid, bool txok)
 232 {
 233         kfree_skb(skb);
 234 }
 235
 236 int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
 237                       enum htc_endpoint_id *wmi_ctrl_epid)
 238 {
 239         struct htc_service_connreq connect;
 240         int ret;
 241
 242         wmi->htc = htc;
 243
 244         memset(&connect, 0, sizeof(connect));
 245
 246         connect.ep_callbacks.priv = wmi;
 247         connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
 248         connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
 249         connect.service_id = WMI_CONTROL_SVC;
 250
 251         ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
 252         if (ret)
 253                 return ret;
 254
 255         *wmi_ctrl_epid = wmi->ctrl_epid;
 256
 257         return 0;
 258 }
 259
 260 static int ath9k_wmi_cmd_issue(struct wmi *wmi,
 261                                struct sk_buff *skb,
 262                                enum wmi_cmd_id cmd, u16 len)
 263 {
 264         struct wmi_cmd_hdr *hdr;
 265
 266         hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr));
 267         hdr->command_id = cpu_to_be16(cmd);
 268         hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
 269
 270         return htc_send(wmi->htc, skb, wmi->ctrl_epid);
 271 }
 272
 273 int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
 274                   u8 *cmd_buf, u32 cmd_len,
 275                   u8 *rsp_buf, u32 rsp_len,
 276                   u32 timeout)
 277 {
 278         struct ath_hw *ah = wmi->drv_priv->ah;
 279         struct ath_common *common = ath9k_hw_common(ah);
 280         u16 headroom = sizeof(struct htc_frame_hdr) +
 281                        sizeof(struct wmi_cmd_hdr);
 282         struct sk_buff *skb;
 283         u8 *data;
 284         int time_left, ret = 0;
 285         unsigned long flags;
 286
 287         if (ah->ah_flags & AH_UNPLUGGED)
 288                 return 0;
 289
 290         skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
 291         if (!skb)
 292                 return -ENOMEM;
 293
 294         skb_reserve(skb, headroom);
 295
 296         if (cmd_len != 0 && cmd_buf != NULL) {
 297                 data = (u8 *) skb_put(skb, cmd_len);
 298                 memcpy(data, cmd_buf, cmd_len);
 299         }
 300
 301         mutex_lock(&wmi->op_mutex);
 302
 303         /* check if wmi stopped flag is set */
 304         if (unlikely(wmi->stopped)) {
 305                 ret = -EPROTO;
 306                 goto out;
 307         }
 308
 309         /* record the rsp buffer and length */
 310         wmi->cmd_rsp_buf = rsp_buf;
 311         wmi->cmd_rsp_len = rsp_len;
 312
 313         spin_lock_irqsave(&wmi->wmi_lock, flags);
 314         wmi->last_cmd_id = cmd_id;
 315         spin_unlock_irqrestore(&wmi->wmi_lock, flags);
 316
 317         ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
 318         if (ret)
 319                 goto out;
 320
 321         time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
 322         if (!time_left) {
 323                 ath_dbg(common, ATH_DBG_WMI,
 324                         "Timeout waiting for WMI command: %s\n",
 325                         wmi_cmd_to_name(cmd_id));
 326                 mutex_unlock(&wmi->op_mutex);
 327                 return -ETIMEDOUT;
 328         }
 329
 330         mutex_unlock(&wmi->op_mutex);
 331
 332         return 0;
 333
 334 out:
 335         ath_dbg(common, ATH_DBG_WMI,
 336                 "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
 337         mutex_unlock(&wmi->op_mutex);
 338         kfree_skb(skb);
 339
 340         return ret;
 341 }